Streams: Fix crash when playing audio

Fix #1249

application/vlc-android/src/org/videolan/vlc/viewmodels/StreamsModel.kt

@@ -44,6 +44,10 @@ class StreamsModel(context: Context, coroutineContextProvider: CoroutineContextP
     val observableSearchText = ObservableField<String>()
     var service: PlaybackService? = null
 
+    private val serviceCb = object : PlaybackService.Callback by EmptyPBSCallback {
+        override fun update() = refresh()
+    }
+
     init {
         if (medialibrary.isStarted) refresh()
         PlaybackService.serviceFlow.onEach { onServiceChanged(it) }.launchIn(viewModelScope)
@@ -81,12 +85,6 @@ class StreamsModel(context: Context, coroutineContextProvider: CoroutineContextP
         }
     }
 
-    private val serviceCb = object : PlaybackService.Callback by EmptyPBSCallback {
-        override fun update() {
-            refresh()
-        }
-    }
-
     class Factory(private val context: Context) : ViewModelProvider.Factory {
         override fun <T : ViewModel> create(modelClass: Class<T>): T {
             @Suppress("UNCHECKED_CAST")